Examine source code of Clean Sphere

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Clean Sphere",
  "manifest_version": 2,
  "description": "Modification of this Persona: <a href=\"https://outgoing.prod.mozaws.net/v1/1466ed7a9c68231733a756da0725e19190e9b40a1ef854b57098006162e3457a/http%3A//www.getpersonas.com/en-US/persona/12\" rel=\"nofollow\">http://www.getpersonas.com/en-US/persona/12</a>"
}